Germacrene B - a central intermediate in sesquiterpene biosynthesis

Area of Science:

• Natural Product Chemistry
• Organic Synthesis
• Biochemistry

Background:

• Germacranes are crucial intermediates in the biosynthesis of sesquiterpenes.
• These neutral intermediates are formed from farnesyl diphosphate and can undergo further cyclization.
• The review focuses on sesquiterpenes derived from the achiral germacrene B.

Purpose of the Study:

• To summarize existing knowledge on eudesmane and guaiane sesquiterpenes.
• To provide a rationale for the structural assignment of these compounds.
• To discuss both naturally occurring and synthetically derived sesquiterpenes.

Main Methods:

• Literature review of accumulated knowledge on sesquiterpene biosynthesis and structures.
• Analysis of structural assignments for 64 identified compounds.
• Inclusion of data from both natural product isolation and organic synthesis.

Main Results:

• A comprehensive presentation of 64 eudesmane and guaiane sesquiterpene hydrocarbons and alcohols.
• Discussion of compounds potentially arising from germacrene B.
• Integration of data from 131 cited references.

Conclusions:

• Germacrene B serves as a pivotal precursor for a diverse range of eudesmane and guaiane sesquiterpenes.
• Understanding the structural pathways from germacranes is essential for sesquiterpene chemistry.
• This review consolidates structural information, aiding future research in natural product synthesis and biosynthesis.